CN204404212U - A kind of power station brown coal drying integrated system based on flue gas recirculating technique - Google Patents
A kind of power station brown coal drying integrated system based on flue gas recirculating technique Download PDFInfo
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- CN204404212U CN204404212U CN201520041571.XU CN201520041571U CN204404212U CN 204404212 U CN204404212 U CN 204404212U CN 201520041571 U CN201520041571 U CN 201520041571U CN 204404212 U CN204404212 U CN 204404212U
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- flue gas
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Abstract
The utility model discloses a kind of power station brown coal drying integrated system based on flue gas recirculating technique belonging to power station energy-saving field.In the generating set using brown coal, coal bunker, weigh between belt and coal pulverizer and set up drying machine.Drying machine drying brown coal is sent into after utilizing the high-temperature flue gas before the air preheater of former power station and the low temperature low cloud of dust gas after deduster to be mixed to applicable temperature, drying machine gas vent is provided with pulverized-coal collector, recovery dry pulverized coal exports coal dust with drying machine and mixes, and is sent to coal pulverizer and continues grinding; Flue gas through purification mixes with the flue gas before flue collector desulfurization unit, accepts desulfurization process, finally by smoke stack emission.The utility model utilizes back-end ductwork flue gas drying brown coal, adds the energy density of brown coal, improves boiler efficiency; Reduce the flue-gas temperature entering desulfurizing tower simultaneously, improve humidity of flue gas, greatly reduce desulfurizing tower water consumption; And dry run oxygen concentration maintains reduced levels, safe and reliable.
Description
Technical field
The utility model belongs to energy-saving equipment field, power station, particularly a kind of power station brown coal drying integrated system based on flue gas recirculating technique.
Background technology
The explored lignite resource of China reaches more than 1,300 hundred million tons, accounts for 13% of national coal reserves.Brown coal are minimus coals in raw coal, and its volatile matter is generally 40% ~ 50%, and total moisture can reach 20% ~ 50%, and air-dried moisture is 10% ~ 20%, and low heat valve generally only has 7 ~ 15MJ/kg.Because the moisture of brown coal own is higher, the exhaust gas volumn that burning generates is bigger than normal, and boiler exhaust gas is lost larger with low moisture coal facies, the direct efficiency of combustion of boiler is lower, and economy is limited, and greenhouse gas emissions are also larger.In addition, high water content brown coal calorific value is lower, makes boiler body bulky, and boiler accessory machinery capacity is also bigger than normal, considerably increases power station investment and station service power consumption rate.
At present, for the problems referred to above, independently brown coal drying system is usually set in thermal power plant and brown coal is carried out dry in advance, the water content of brown coal is reduced to a certain degree, then brown coal are transported in boiler and carry out burning and generating electricity.Utilize the drying of flue gas direct mixed coal powder to be drying mode the most ripe at present, it is simple that it has structure, drying efficiency advantages of higher.But flue gas drying needs to extract a certain amount of high-temperature flue gas (about 600 DEG C ~ 700 DEG C) at burner hearth usually, result in the loss of high-grade energy.
Summary of the invention
The purpose of this utility model is to provide a kind of power station brown coal drying integrated system based on flue gas recirculating technique, it is characterized in that in the generating set using brown coal, Pulverized Coal Bin 10 is fixed on above belt 11 of weighing, weigh between belt 11 and coal pulverizer and set up drying machine 12, the entrance of its drying source is before flue gas mixing valve A 8 is connected to back-end ductwork air preheater 2 respectively and deduster 5, the rear pass of air-introduced machine 6, the gas vent of drying machine 12 is connected with pulverized-coal collector 13, pulverized-coal collector 13 outlet at bottom and drying machine 12 outlet at bottom are all connected to coal pulverizer, pulverized-coal collector 13 gas vent is connected to desulfurization unit 16 through flue gas mixing valve B 14, flue before booster fan 15, booster fan 15, desulfurization unit 16 is connected successively with chimney 17.
Described drying machine 12 is mobile bed drying machine, and its suitable baking temperature is 150 DEG C ~ 200 DEG C.
Described flue gas mixing valve A 8 place, mix with the flue gas come after Self-duster 5, air-introduced machine 6 from the high-temperature flue gas before air preheater 2, mixed flue gas is sent to drying machine 12, and high-temperature flue gas pipeline and low-temperature flue gas pipeline arrange flow control valve A 4 and flow control valve B 7 respectively.
Described flue gas mixing valve B 14 place, the flue gas from drying machine 12 and through pulverized-coal collector 13 purification mixes with flue collector flue gas, and mixed flue gas enters desulfurization unit 16 and chimney 17 through booster fan 15.
The beneficial effects of the utility model are:
1. integrated drying system in original pulverized coal preparation system, adopt the low-grade energy in thermal power plant, namely boiler back end ductwork flue gas is as drying machine dehydration mediators, directly contacts with brown coal, and blending, disturbance are strong, drying efficiency is high, raw coal moisture can reduce and more originally reduce 10%-15%, and the energy density of coal improves more than 10%, and this is not only conducive to the smooth combustion of coal, decrease the flue gas loss of boiler, the efficiency of boiler can improve 2% ~ 3%; After brown coal drying, energy density improves simultaneously, and boiler furnace volume reduces, and subsidiary engine is exerted oneself and ensured, power station equipment investment reduces; And dry run oxygen content maintains reduced levels, security is good;
2. the low temperature high-moisture tail gas of drying machine discharge is mixed into flue collector smoke evacuation, exhaust gas temperature is made to have dropped 10 DEG C ~ 20 DEG C, moisture rises more than 10%, desulfurization unit is entered through booster fan, greatly reduce the water consumption of desulfurization unit, for 600 MW lignite-fired unit, expectation can be economized on water 50 ~ 80 t/h;
3. by extracting the high-temperature flue gas before part air preheater, reducing the exhaust gas volumn of heat exchange in air preheater, the problem that the exhaust gas temperature easily occurred after being expected to alleviate conventional power plant combusting brown coal is too high, also making the cigarette temperature entering desulfurizing tower reduce further.
Accompanying drawing explanation
Fig. 1 is a kind of schematic diagram of the power station brown coal drying integrated system based on flue gas recirculating technique.
In figure: 1-pressure fan; 2-air preheater; 3-boiler; 4-flow control valve A; 5-deduster; 6-air-introduced machine; 7-flow control valve B; 8-flue gas mixing valve A; The dry air-introduced machine of 9-; 10-Pulverized Coal Bin; 11-weighs belt; 12-drying machine; 13-pulverized-coal collector; 14-flue gas mixing valve B; 15-booster fan; 16-desulfurization unit; 17-chimney.
Detailed description of the invention
The utility model provides a kind of power station brown coal drying integrated system based on flue gas recirculating technique, is described further native system operation principle below in conjunction with the drawings and specific embodiments.
Figure 1 shows that the schematic diagram of the power station brown coal drying integrated system based on flue gas recirculating technique.
This system is mainly in the generating set using brown coal, Pulverized Coal Bin 10, weigh between belt 11 and coal pulverizer and set up mobile bed drying machine 12, the entrance of its drying source is before flue gas mixing valve A 8 is connected to back-end ductwork air preheater 2 respectively and deduster 5, the rear pass of air-introduced machine 6, the gas vent of drying machine 12 is connected with pulverized-coal collector 13, pulverized-coal collector 13 outlet at bottom and drying machine 12 outlet at bottom are all connected to coal pulverizer, pulverized-coal collector 13 gas vent is connected to desulfurization unit 16 through flue gas mixing valve B 14, flue before booster fan 15, booster fan 15, desulfurization unit 16 is connected successively with chimney 17.
Its course of work is: in air side, and the air of environment temperature is carried by pressure fan 1, enters in air preheater 2 after being heated to setting hot blast temperature and is sent to boiler 3, in fume side, part of smoke (about 350 DEG C ~ 380 DEG C) flue before air preheater 2 is shunted, mix in flue gas mixing valve A 8 with the part smoke evacuation (about 120 DEG C ~ 150 DEG C) come after Self-duster 5, mixed flue-gas temperature is about 200 DEG C, send into drying brown coal in drying machine 12, the tail gas of discharge is separated after 13 device purifications through fine powder, temperature is about 80 ~ 100 DEG C, mix with flue collector flue gas (about 120 ~ 150 DEG C) in flue gas mixing valve B 14, mixed flue-gas temperature is about 110 ~ 140 DEG C, desulfurization unit 16 is sent to successively subsequently by booster fan 15, chimney 17, in coal dust side, drying machine 12 sent into by the belt 11 of weighing of the high water content brown coal in Pulverized Coal Bin 10, and dried coal dust is discharged by drying machine 12 bottom, and the coal dust be separated with pulverized-coal collector 13 is sent to coal pulverizer together and grind, and finally feeding boiler 3 burns.
Claims (4)
1. the power station brown coal drying integrated system based on flue gas recirculating technique, it is characterized in that, in the generating set using brown coal, Pulverized Coal Bin (10) is fixed on belt of weighing (11) top, weigh between belt (11) and coal pulverizer and set up drying machine (12), the entrance of its drying source is through flue gas mixing valve A(8) be connected to before back-end ductwork air preheater (2) respectively and deduster (5), the rear pass of air-introduced machine (6), the gas vent of drying machine (12) is connected with pulverized-coal collector (13), pulverized-coal collector (13) outlet at bottom and drying machine (12) outlet at bottom are all connected to coal pulverizer, pulverized-coal collector (13) gas vent is through flue gas mixing valve B(14) be connected to desulfurization unit (16), flue before booster fan (15), booster fan (15), desulfurization unit (16) is connected successively with chimney (17).
2. a kind of power station brown coal drying integrated system based on flue gas recirculating technique according to claim 1, it is characterized in that, described drying machine (12) is mobile bed drying machine, and its suitable baking temperature is 150 DEG C ~ 200 DEG C.
3. a kind of power station brown coal drying integrated system based on flue gas recirculating technique according to claim 1, it is characterized in that, described flue gas mixing valve A(8) place, mix with the flue gas come after Self-duster (5), air-introduced machine (6) from the high-temperature flue gas before air preheater (2), mixed flue gas is sent to drying machine (12), and high-temperature flue gas pipeline and low-temperature flue gas pipeline arrange flow control valve A(4 respectively) and flow control valve B(7).
4. a kind of power station brown coal drying integrated system based on flue gas recirculating technique according to claim 1, it is characterized in that, described flue gas mixing valve B(14) place, mix with flue collector flue gas through the flue gas that pulverized-coal collector (13) purifies from drying machine (12), mixed flue gas enters desulfurization unit (16) and chimney (17) through booster fan (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520041571.XU CN204404212U (en) | 2015-01-22 | 2015-01-22 | A kind of power station brown coal drying integrated system based on flue gas recirculating technique |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520041571.XU CN204404212U (en) | 2015-01-22 | 2015-01-22 | A kind of power station brown coal drying integrated system based on flue gas recirculating technique |
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| CN204404212U true CN204404212U (en) | 2015-06-17 |
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| CN201520041571.XU Expired - Fee Related CN204404212U (en) | 2015-01-22 | 2015-01-22 | A kind of power station brown coal drying integrated system based on flue gas recirculating technique |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107899725A (en) * | 2017-12-15 | 2018-04-13 | 航天长征化学工程股份有限公司 | Energy-saving and environment-friendly coal grinding and drying system and tail gas treatment method thereof |
| CN109708102A (en) * | 2018-12-29 | 2019-05-03 | 彭晓敏 | A kind of Coal Feeding System for Circulating Fluidized Bed Combustion Boiler |
| CN112361800A (en) * | 2020-10-12 | 2021-02-12 | 新疆宝新昌佳石灰制品有限公司 | Method for drying pulverized coal by using waste heat of rotary kiln |
-
2015
- 2015-01-22 CN CN201520041571.XU patent/CN204404212U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107899725A (en) * | 2017-12-15 | 2018-04-13 | 航天长征化学工程股份有限公司 | Energy-saving and environment-friendly coal grinding and drying system and tail gas treatment method thereof |
| CN107899725B (en) * | 2017-12-15 | 2024-02-23 | 航天长征化学工程股份有限公司 | Energy-saving and environment-friendly coal grinding and drying system and tail gas treatment method thereof |
| CN109708102A (en) * | 2018-12-29 | 2019-05-03 | 彭晓敏 | A kind of Coal Feeding System for Circulating Fluidized Bed Combustion Boiler |
| CN112361800A (en) * | 2020-10-12 | 2021-02-12 | 新疆宝新昌佳石灰制品有限公司 | Method for drying pulverized coal by using waste heat of rotary kiln |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150617 Termination date: 20160122 |
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| EXPY | Termination of patent right or utility model |